DFRobot
Carbon Monoxide Sensor (MQ7)
The MQ7 is a simple-to-use Carbon Monoxide (CO) sensor suitable for detecting CO concentrations in the air. It offers a wide detection range from 20 to 2000 ...
The MQ7 is a simple-to-use Carbon Monoxide (CO) sensor suitable for detecting CO concentrations in the air. It offers a wide detection range from 20 to 2000 ppm, making it ideal for safety monitoring and air quality projects.
The sensor outputs an analog resistance that varies with CO concentration. The drive circuit is straightforward — power the heater coil with 5V, add a load resistance, and connect the output to an ADC for reading.
Key Features
- Wide Detection Range – 20 to 2000 ppm carbon monoxide
- Analog Output – Simple resistive output for easy integration with microcontrollers
- 5V Operation – Compatible with Arduino, Raspberry Pi, and other common platforms
- Simple Interface – Requires only a load resistor and ADC connection
Specifications
- Supply Voltage – 5V
- Detection Gas – Carbon Monoxide (CO)
- Detection Range – 20–2000 ppm
- Output – Analog resistance
Ideal For
- Air quality monitoring systems
- CO safety alarms and detectors
- Environmental sensing projects
- Arduino and microcontroller-based gas detection
Package Contents
- 1× Carbon Monoxide Sensor (MQ7)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
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Brands
MQ-7 Gas Sensor Technical Data
Datasheet · 52.2 KB · Click any page to view full size
Supplier page — dfrobot.com
Supplier Description · 527.3 KB · Click any page to view full size
Related Tutorials
Free guides on learn.littlebird.com.au
